Derrick.



No. 656,079. Patented Aug. 14, I900,

E. P. ARSNEAN. V I

D E B R l C K (Application filed Mar. 24, 1900.)

(No Model.)

UNITED STATES PATENT 'FFICE;

DERRICK.

SPECIFICATION forming part of Letters Patent No. 656,079, dated August 14, 1900.

Application filed March 24, 1900. Serial No. 10,104. (N model,)

To all whom it oonoe rm,

Be it known that I, EDWARD P. ARSNEAN, a citizen of the United States, residing at Du-' luth, in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements in'Derricks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in derricks; and it comprises a base, a derrick proper mounted thereon, a cross brace or bar on the said derrick,an anchor-beam pivotally secured to'the said base,and means for adj ustably securing the cross-braceto the anchorbeam at different points along its-length,

whereby the derrick may be varied in its position with respect tothe base and may be positively held against movement in either direction by the said brace.

It also consists in certain other novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and specifically claimed.

In the accompanying drawings, Figure 1 represents a side elevation of a derrick 'constructed inaocordance withmy invention. Fig. 2 represents a front elevation of the same. Fig. 3 represents adetail sectional View through one of the sills of the derrickbase, showing the manner of mounting one end of the anchor-beam. Fig. 4 represents a detail'view showing the socket for receiving the lower end of one of the derrick beams or poles, and Fig. 5 represents a detail view of one of the blocks used upon the derrick.

My improved derrick is of exceedingly-simple construction, it being designed to supply derricks which can be easily and readily handled, which can be adjusted'to the various positions in which it maybe used, and which,

- although light in construction, will be sulficiently strong for the purposes required. The derrick comprises a derrick frame proper, as 1, formed of poles or beams 2 2, and which may be secured at theirtop by means of a cross-head piece, as 3, or, if desired, may be beveled and secured to each other. The lower ends of the derrick-poles 2 2 are preferably reduced and formed with tenons, as 4, upon their ends, which are adapted to enter suitable anchorage. anchor-beam 11 is preferably pivoted in aandl'est in sockets or mortises 5, formed in the sill of the derrick-support. The derrickpoles 2 rest loosely in the sockets 5, but are prevented from being accidentally displaced by means of short slack chains, as 6 6, which are secured in eyes in the sill and derrick- This allows of sufiicient play for the I prefer- The base or support of the derficient strength and rigidity to the derrickbase. Near the upper end of the derrick 1 and between the poles 2 2 I preferably mount a nullev or sheave 9 About midway of he height of the poles 2 a cross-beam, as 10, is secured to both of the derrick-poles 2 2.

The derrick is adapted to be adjusted and braced in different positions by means of an anohor-beam, as 11, which is pivoted, as at 12, at its lower end to one of the sills 7, its otherend being provided with a series of apertures, as 13, whieh'may be made to register with an aperture 14 in the cross-beam 10, apin 15 being inserted through the registering apertures to secure the anchor-beam to the derrick. By adjusting the pin to difierent holes in the anchor-beam the derrick may be held at difierent heigh'tsz; 'lhe derrick may be furtherguarded against strain and braced in position by means of a guyrope or chain 16, securedat one end to the to'pfof the derrick and running at its other end to any The lower end of the strap-staple,as 17, provided with a bolt 18, which extends through the sill 7 and is socured ,therein by means of a nut. A pivotpin,. as' 19, passes through the staple 17 and the lower end of the anchor-beam. The draft cable or chain 20 employed preferably passes from the top of the derrick, to which it is secured, downwardly and about a hoistingblock 21, thence upwardly and over a sheave 9, from which it passes downwardly again and around a swiveled block 22, secured to the sill 7 The cable is thence carried off where suittion when the guy-line is loose, but when moving the machine from point to point, since without it there would be nothing to prevent beam'will prevent such difiiculty from arising.

.ing the said hooks.

i 2; A derrick comprising a base, a derrick r-in the'base, slack chains for connecting the able power may be applied to it for lifting the logs to be hoisted. The swivel-block 22 is provided with a hook 23, which is swiveled to the said block, the-said hook being adapted to engagean eyebolt secured to the sill 7. The block 22 is also supplied with a swiveled' eye 25 at its upper end, which is connected, by means of the cable or rope 26, with an eyebolt 27, secured to the cross-beam 10. This cable or rope 26 operates to hold the swivelblock 22in a vertical position at.all times, and especially when there is any strain upon the draft-cable. 'The hoisting-block 21' may be provided with a crotch-chain, as 28, having hooks 29 29 at its ends, of any desired construction. A desirable way of forming these books is to supply them with eyes, as 30,'to which may be secured ropes 31 for guid- A derrick of this character is especially well adapted for lifting logs, and when so used the strain of holding the derrick up is chiefly on the guy line or cable 16. The adjustable anchor-beam isof great importance, for it is adapted not only to hold the derrick in posithe derrick from falling backward or forward. When the derrick is held in its vertical position and is being moved, it is likely to be knocked over by striking trees as it passes from place to place; but the anchor- Having thus described my. invention, what I claim'jas new, and desire to secure by Letters Patent, is- 1 1. A derrick, comprising a base, a derrick proper movably [mounted thereon, a cross brace or bar on the said derrick, an' anchorbeam pivotally secured V to the said base, means for ad justably securing the cross-brace to the anchor-beam at different. points along its length, whereby the derrick may be varied in its position'with respect to the base, the construction being such that the derrick will be positively held against movement in either direction by the said brace.

proper formed -of poles joined together at their tops and provided with tenons at their lower ends adapted to rest in'sockets formed derrick-poles with the base so that they cannot he accidentally displaced from their sockets, and means for bracing the derrick in position, substantially as described. 4

3.. A derrick comprising abasc having mortises or sockets formed therein, a derrick proper mounted upon said base and having tenons engagin g said sockets, the said tenons being rounded at their ends so that they may have a pivotal movement in said sockets, a guy-rope for holding the .upper end-of the derrick against lifting strains, and an anchor-beam pivoted to the base andadjustably secured to the derrick for further bracing the same, substantially as described.

4. A derrick comprising a base, a derrick proper formed 'of beams joined together at their tops and resting in sockets at their lower ends, a cross brace or beam upon the said derrick proper, an anchor-beam pivoted at one end to the base and provided at its other end with a series of apertures, a pin for adj ustably connecting the apertured end of the anchor-beam with the cross-beams of the derrick, whereby the derrick will be prevented from tipping forward or backward, a sheave or pulley mounted at the apex of the derrick, a swivel-block secured to' the base, and a hoisting-block for receiving a hoistingcable, substantially as described.

5. A derrick comprising a base, a derrick proper formed of derrick-poles secured to-' 'gether at their upper ends and spread apart at their lower ends, a brace-rod connecting the said poles about midway of their length,

an anchor-beam or bracing the said derrick and adjustably connected with the crossbeam, a sheave mounted at the apex of the derrick, a swivel-block secured to the base, a cable or rope connecting the swivel-block with the cross-brace so that the said block will be held vertical when the draft-cable is slack, a hoisting-block, a crotch-chain, hooks carried thereby, and a draft cable or rope passing over the blocks and sheaves for raising and'lowering the hoisting-block, substantially as described.

In testimony whereof I .hereunto aflix my signature in presence of two witnesses.

EDWARD P. ARSNEAN.

Witnesses:

JAMES T. WATSON, D. D. Mclmus. I 

